Grinding guide and carrier



Feb 26, 1957 G. H. ISCHE 2,7825% GRINDING GUIDE AND CARRIER Filed Nov. 9, 1954 INVENTOR' ATTORNEYJ GRHIDING GUIDE AND CARRIER George H. Ische, Minneapolis, Minn. Application November 9, 1954, Serial No. 467,765

4 Claims. (Cl. 51-122) My invention relates generally to improvements in grinding carriers and fixtures and more specifically to a guide and carrier for use, in conjunction with the abrasive wheel of a bench grinder or the like, for grinding the blades of forage harvesters, ensilage knives, stalk cutter blades, various tools and the like.

The satisfactory grinding of forage cutter blades, as an example, has long been a problem. Such blades are quite large and heavy and have a long, gradually beveled cutting edge which must be accurately ground if the blade is to function properly in the machine. Obviously it is difiicult, if not actually impossible, to simple hold these blades by hand and guide them across a grinding wheel and what is needed is a means for guiding the rates Patent blade in a straight path across the wheel and at a proper angle with respect thereto. It is the primary object of my invention, therefore, to provide means for this purpose which will enable the operator to rapidly, accurately and safely grind such knives, and analogous tools, with the abrasive wheel of any ordinary bench grinder.

Another object is to provide a grinding fixture made up of a suitable guide rail positioned adjacent the grinder wheel and having a guide edge whereon may be rested a carrier which has clamp means for fastening to the blade which is to be ground. The said carrier also has a guide groovev to slidably seat down over the guide edge of the rail and the carrier and its clamped blade may then be reciprocated as a unit along the rail, with the cutting edge of the blade in proper contact with the wheel, the rail serving to guide the blade in a straight path as required.

A further object is to provide in a fixture as just described an adjustable mounting for the guide rail, permitting it to be adjusted in a plurality of directions with respect to the grinding wheel to thereby enable the operator to set up the fixture so that the blade or tool being ground will meet the wheel at the proper angle for grinding the desired beveled edge.

These and other more detailed and specific objects will be disclosed in the course of the following specification, reference being had to the accompanying drawings, in which- Fig. 1 is a perspective view of the grinding guide and carrier elements of my invention, showing the same in conjunction with a bench grinder and With a knife in place ready for grinding.

Fig. 2 is an elevational view of the guide and carrier, the blade and bench appearing only in broken lines.

Fig. 3 is an end view of the guide elements alone.

Fig. 4 is a perspective view of the carrier element alone.

Referring now more particularly and by reference characters to the drawing, I have illustrated my invention in Fig. 1 as used in connection with the abrasive wheel A of a well known form of bench grinder B which is secured to a Work bench C or other suitable work surface. The wheel A has both a peripheral grinding face D and an end radial grinding face E, the latter a cupped formation. A forage cutter blade is shown at F and has the usual long, gradually beveled cutting edge G. At the other end of the grinder is another wheel H for any purpose desired.

My invention comprises a guide assembly designated generally at 10 and a carrier element which is designated generally at 11.

The assembly 10 is made up of a base angle 12 having a horizontal web 13 and a vertical, upstanding web 14, and of a flat, rectilinear guide rail 15. The web 13 of the base angle 12 is provided with a series of notches indicated collectively at 16 and bolts provided with wing nuts 17 are used as clearly shown for firmly securing the base angle to the work bench C. The notches 16 open through the free edge of the web 13 and they are so spaced that the base angle may be secured to the work bench in any of several longitudinally different positions, with respect to the grinder B. The guide rail 15 is also provided with spaced, downwardly opening notches 18 to receive bolts fitted with wing nuts 19 for clamping the rail to the web 14 of the base angle 12, the notches again being so spaced that the rail may be arranged and secured in different positions lengthwise with respect to the base angle. In Fig. 1 this guide assembly 10 is shown as arranged crosswise with respect to the axis of the grinding wheel A and spaced from the end face E thereof.

The carrier element 11 is preferably a casting having a base 20 adjacent the opposite ends of which are upstanding clarnp lugs'2122. At the opposite side, midway between the lugs 2122 the base also has an upwardly extending center lug 23 which is bored and tapped to receive a clamping screw 24 having a large knurled head 25. Thus there is provided a convenient means for clamping the forage cutter blade F or the like, the blade being placed against the lugs 2122 and the screw 24 turned against the center part of the blade to secure the carrier and blade firmly together, with the cutting edge G of the blade in the clear. The underside of the base 20 of the carrier 11 is formed with a longitudinal groove 26 extending from end to end of the carrier and adapted to ride the upper, narrow guide edge 27 of the rail 15.

In operation the blade is ground by placing the carrier 11 upon the guide rail 15 so that the groove 26 rests, as stated, upon the edge 27 of the guide rail and the carrier is then moved along the guide rail until the beveled cutting edge G of the blade meets the end face E of the grinding wheel A. The blade and its carrier are tipped or canted toward the wheel to cause the blade to lie at the proper bevel angle and the angle may be adjusted by loosening the wing nuts 17 and moving the entire assembly toward or away from the wheel. Also the blade may be properly adjusted to the grinding Wheel by loosening the wing nuts 19 and raising or lowering the guide rail 15 according to the height of the wheel axis above the work bench. Once the proper adjustments are made the blade may then be quickly, accurately and safely sharpened merely by working the blade back and forth across the wheel, the carrier 11 being guided in a straight line by the guide rail 15 and the large head 25 of the clamp screw forming a conveniently palmfitting handle for manipulating the carrier.

It will be obvious from the foregoing that I have provided a convenient means whereby forage cutter blades, and similar large blades and tools which have heretofore offered a considerable problem in proper grinding, may be accurately guided across the grinding wheel to form the desired cutting edge, and that the said means may be readily adjusted and set up according to the nature of the blade being ground. Also it will be understood that, while I have herein shown my invention as arranged to use the end face E of the wheel, I may also position the guide assembly across the front of the grinder so that the peripheral surface D of the wheel is used, this providing for hollow grinding of the blade if so desired. In either case, of course, the guide rail will be so positioned with regard to the wheel A that it will support the carrier element 11 while the blade is moved entirely across the wheel.

It is understood that suitable modifications may be made in the structure as disclosed, provided such modifications come within the spirit and scope of the appended claims. Having now therefore fully illustrated and described my invention, what I claim to be new and desire to protect by Letters Patent is:

1. For grinding the beveled edge of a cutting blade of the character described upon the radial end face of an abrasive wheel operatively arranged above a work surface, a guide rail having an upper guide edge extending tangentially to a circle centered on the axis of the wheel and spaced from the end face thereof, an angle iron and means mounting the said guide rail on the angle iron for up and down movements and means mounting the angle iron upon the work surface for adjustment toward and away from the wheel, a carrier for holding the blade as it is ground and having spaced lugs and a clamp screw for clamping the blade against said lugs with the beveled edge of the blade projecting above the lugs, and the carrier having in its bottom an elongated groove resting upon the said guide edge of the guide with the beveled edge of the blade engaging the end face of the wheel whereby as the carrier is moved along the guide rail the blade will be guided at the proper path and at the proper angle across the radial end face of said wheel.

2. As a composite article of manufacture of the character and for the purposes described, a grinding fixture comprising a base angle having bolt openings in both of its webs, a rail and bolts securing the same to one of said webs, the rail having notches for said bolts, said rail having an elongated guide edge, a carrier having a base groove slidably engaging said guide edge, and clamping means on the carrier opposite said groove.

3. As a composite article of manufacture of the character and for the purposes described, a grinding fixture comprising a base angle having bolt notches in one of its webs, a rail and bolts securing the same to the other of said webs, the rail having notches for said bolts, said rail having an elongated guide edge, a carrier having a base groove slidably engaging said guide edge, and clamping means on the carrier opposite said groove, the said clamping means including a screw having a head serving also as a handle for moving the carrier along said guide edge.

4. A grinding guide and carrier for grinding forage harvester and ensilage knives and for mounting on a work surface adjacent a grinder wheel having a grinding surface, comprising in combination, a two-part guide fixture including a base member having a horizontal web resting on the work surface and an upstanding web, said horizontal web having spaced apart notches and means in said notches securing the base member to the work surface for adjustment thereon toward and aw.. from the wheel, the other part of said two-part fixture consisting of an elongated guide rail mounted on edge upon the upstanding web of the base member, said rail having spaced apart notches and means extending therethrough securing the rail to the upstanding web for up and down adjustment with respect to the wheel, the rail having an elongated upper guide edge, a carrier for holding the blade to be ground, said carrier having a base and upstanding clamp lugs at the ends thereof whereby the blade may rest on said base and against the lugs, a center lug on the base and a clamp screw threaded therethrough to bear against the blade and clamp it in place, and the base of said carrier having a longitudinal groove resting on the upper guide edge of said guide rail whereby movement of the carrier lengthwise along the guide rail with the blade leaning against the grinding surface of the wheel will grind the blade at an angle.

References Cited in the file of this patent UNITED STATES PATENTS 1,040,687 Johnson Oct. 8, 1912 1,275,208 Bockshe Aug. 13, 1918 2,052,837 Makaroft Sept. 1, 1936 2,120,500 Makarolf June 14, 1938 2,164,212 Le Blond June 27, 1939 2,192,981 McMillen Mar. 12, 1940 2,565,291 Amendola Aug. 21, 1951 2,636,326 Rivard Apr. 28, 1953 2,637,150 McQuary May 5, 1953 

